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Should I go out of my way to get 2 identical RAM modules or not?

I have a fairly rare (afaik) laptop, a Compal FL90. I quite like it, but it only came with 2Gb RAM, I think it would be most appropriate to double that. The thing is, I couldn't so far find the same module in the UK, but I could order one from Poland - well, to be precise, ask a friend to order it, somehow pay him, arrange delivery- so it's a bit of a kerfuffle.
My question is: is it worth all the trouble to have the exact same module (and a few extra £s)?
Edit: forgot to add that the current RAM is a GoodRAM GR667S264L5/2G DDR2 module, if anyone happens to have one in the shed.

Without knowing much about the specific machine, it is always a good idea to try and match identical ram modules in pairs. It hasn't always been that way, and hopefully someone will correct me if I'm wrong, but many motherboards are designed to work best, or work at all, with matching ram.

Alternatively, you can probably get a single 4GB module for cheapish these days and avoid the hassle, if the mobo supports it.

That way, you can even try and stick the old 2GB module in with the 4 and see if you can get a total of 6.

You don´t have to have identical modules -- they will likely work if the modules share a common speed. I have different sticks in my laptop, and it´s fine. One´s by Kingston, the default stick is by Samsung. They´re the same speed though (PC3-10700) and the same size, which pretty much guarantees it works.

If you want to just add RAM, just match the speed which is crucial for it to work. You can and probably will want to match the size too.

However if you can remove and replace the current RAM for all you know your laptops motherboard might be able to handle a higher speed ram and you could get yourself two brand new sticks at a higher speed.

No, as long as they are set to the same speed (maybe same timings to be safe) it will work fine.
Stores recommend the same ram for very obvious reasons: to get people to buy 2 sticks instead of one when they want to upgrade.